Industrial X-Ray
Chiller Manual XRCA-3001-WA
For OEM
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 1 of 16
Document history
Version
1.0
2.0
3.0
4.0
Date
03/31/2010
07/23/2010
10/30/2012
07/01/2013
07/30/2014
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
Author
M. Schmid
St. Haferl
R. Moser
R. Moser
R. Moser
Amendment(s)
Layout/structure
Status
Released
Layout/structure
Update Chapter 2+3
Outline drawing added
XRCA-3001-WA, Doc.-No. 50005554
Page 2 of 16
Caution:
 Read the manual before setting to work!
 Always keep cooling unit in upright position and do not shock
 Power supply 230 V 50/60 Hz / 208 V 50/60 Hz!
 Run cooling unit always with correct coolant level and clean filter regular otherwise damage of pump may occur!
 Only use cooling hoses with sufficient pressure and coolant resistance!
 Never operate damaged or leaking equipment!
 Before starting any service work disconnect the cooling unit from power supply!
 Never carry out any work at the refrigeration cycle, this work must be carried
out at manufacturer site!
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 3 of 16
Contents
1. Description ................................................................................................................ 5
2. Technical data ........................................................................................................... 6
3. Performance chart .................................................................................................... 7
4. Setting to work .......................................................................................................... 8
5. Settings ..................................................................................................................... 9
6. Maintenance ........................................................................................................... 12
7. Outline Drawing ...................................................................................................... 13
8. Circuit Diagrams ..................................................................................................... 14
9. Declaration of conformity ........................................................................................ 16
Appendix: Flow diagram and Circuit diagram
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 4 of 16
1. Description
The cooling unit WLK 32 is designed to provide a continues flow of cooling fluid at a
constant temperature. Water circulates between the cooling unit and the heat source.
The water is chilled by an air-cooled refrigeration system (refrigerant R 134A).The
cooling unit has a main switch to start the refrigeration system. The water level in the
reservoir is supervised by a level switch. If the level drops below minimum, the refrigeration cycle stops and the pilot lamp "Water level low" is activated and the safety
circuit is activated.
The maximum cooling capacity of the cooling unit depends on the ambient and the
fluid temperature. The cooling capacity is 3000W related to 40 °C ambient temperature
and +25 °C ± 2°C fluid temperature. Cooling hoses are connected to the cooling
unit via quick connectors. Water inlet and outlet are marked with symbols:


Inlet: O Outlet: O .
The water outlet temperature is monitored by an electronic temperature controller.
This controller is provided with additional contacts to prevent freezing and for
temperature maximum signal.
The signals "temperature maximum" and "water level low" are combined in a potential
free safety circuit. The water pressure of the pump is limited by an adjustable
bypass valve.

Note: If the ambient temperature is below the adjusted anti freezing
temperature the refrigeration system does not operate! Anti freezing,
temperature maximum and bypass valve is factory adjusted according to
specification.
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 5 of 16
2. Technical data
Physical dimensions
Length:
Width:
Height:
Weight:
Coolant capacity:
590 mm
612 mm
925 mm
115 kg without coolant
14 l
Performance data
Cooling capacity:
Water flow:
Voltage rating:
Current consumption:
Noise level:
Airflow at 50Hz (60Hz):
Safety class:
3000 W at 40°C ambient temperature
 6.0 l/min at 4 bar
230 V / 50/60 Hz (switchable to 208 V / 50/60 Hz)
< 9.3 A
 65 dB(A), distance 1 m in any direction
1700 m3/h (2200 m3/h)
IP 33
Environmental specifications
Ambient temperature:
Storage temperature:
Air humidity:
+ 5 °C ... + 40°C
- 25°C... + 70°C (storage without water)
20 % ... 90 % non condensing
Refrigeration cycle
Refrigerant:
Capacity:
R 134A
1.3 kg
Settings
Maximum pressure
Water outlet temperature (T1):
Anti freezing (T2):
Temperature MAX (T3):
Flow switch open:
Flow switch close:
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
 6.7 bar
+25°C
+ 5°C
+35°C
< 4 l/min
> 4.2 l/min
XRCA-3001-WA, Doc.-No. 50005554
Page 6 of 16
3. Performance chart
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 7 of 16
4. Setting to work









the cooling unit must be positioned in an upright and
free-standing position for sufficient air circulation
use locking brake at caster
remove top cover
connect hoses with cooling unit
remove cap of reservoir and fill the reservoir with water
about 3 cm below thread
For ambient temperatures lower than 10°C use antifreeze. We recommend Ethylenglycol with tap water in
a mix of 2:3
check coolant level and refill if necessary
Establish electrical connection
Note: Operate equipment only with correct coolant level, otherwise danger of
pump destruction!



switch on the equipment for some minutes for the ventilation of the circuit
replace plastic cap of reservoir by applied brass cap
mount cover
Operation on different mains voltages
The installed transformer makes operation on either
208V 50/60Hz or 230V 50/60Hz possible.
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 8 of 16
5. Settings

Note:
The temperature controller and the bypass valve are adjusted according specification. Settings of water outlet temperature, temperature maximum (parameter P1),
anti freezing, and bypass valve should not be changed. If it is necessary to change
these settings refer to the following:
Set maximum pressure:


Basic adjustment < 6,7 bar
Solve sealing
Increasing maxium pressure:


Turn set screw clockwise
reducing maximum pressure: turn
set screw anti-clockwise
Set flow switch




Unscrew fixing screw of contactor
head
Scale up +: move contactor head in
the direction of the oil flow
Scale down -: move contactor head
against the direction of the oil flow
Screw on fixing screw of contactor
head
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 9 of 16
Temperature controller
Description of indicating LED's:
LED 1:
LED on:
cooling on
LED off:
"heating" of refrigeration circuit
LED 2:
LED on:
Temperature maximum exceeded
LED off:
LED 3:
LED on:
cooling unit ready
LED off:
Temperature below anti freezing, running of refrigeration system
Impossible
Water outlet temperature (rated value) T1
Press SET-key and keep it pressed (rated value is shown on display)
Release SET-key (actual value is shown on display)

Note: Hysteresis of T3 is adjusted at ± 4°C
symmetrical to rated value
Anti freezing T2
Press keys  (UP) and  (DOWN) simultaneously
for 4
seconds, P1 is shown on display
Select to parameter P30 with key  (UP)
Press SET-key and keep it pressed
(value of T2 is shown on display)

Note: Hysteresis of anti freezing T2 is adjusted at 4°C. If temperature drops below
anti freezing temperature (+5 °C)
refrigerating unit runs only if temperature exceeds +9 °C.
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 10 of 16
Temperature maximum T3
4 seconds, P1 is shown on display
Press SET-key and keep it pressed (value of P1 is
shown on display)

Note: Hysterese of T3 adjusted at ± 2,5°C symmetrical to parameter P1.
Example:
Value P1: 32.5°C

Temperature maximum T3:

fault indication ON: 35.0°C

fault indication OFF: 20.0°C


Release SET-key (P1 is shown on display)

to run-mode (if there is no changing of parameters, the temperature controller
returns automatically into run-mode after 45 seconds).
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 11 of 16
6. Maintenance
In order to achieve maximum cooling capacity keep the condenser of the cooling unit
clean. Regularly once a week check this heat exchanger and if necessary clean it:
Clean fins of heat exchanger:
Remove dust by forcing it out in the opposite direction from which it entered. If compressed air is available, direct the air against the inside of the condenser.
The water circuit is an open system. Evaporation of water may occur. Check water
level regularly and refill if necessary. Check antifreeze.
About every 3 months check the filter of the pump for clean condition, if necessary
more often. For this proceed as following:

Note: If the filter is not in clean condition damage of pump and motor may
occur!










Disconnect the cooling unit from mains
Remove cover
Close stop valve
Unscrew filter of the pump and check
the filter for impurity
Notice: Water will run out of pump.
Collect the water with suitable vessel
If necessary clean the filter
Screw the filter into the pump
Check water level and refill
if necessary
Remove spilled out water
Open stop valve
Attention: Never operate cooling unit when stop valve
is closed, otherwise damage of pump may occur!


Connect the cooling unit to the mains and run
cooling unit about 10 minutes to deaerate cooling circuit. Check filter for leakage
Mount cover of the cooling unit
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 12 of 16
7. Outline Drawing
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 13 of 16
8. Circuit Diagrams
Electrical diagram
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 14 of 16
Block diagram
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 15 of 16
9. Declaration of conformity
COMET AG Herrengasse 10, CH-3175 Flamatt
Tel. +41 31 744 9000, www.comet-xray.com
XRCA-3001-WA, Doc.-No. 50005554
Page 16 of 16